Publications
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Influence of pore pressure change on coseismic volumetric strain
Coseismic strain is fundamentally important for understanding crustal response to changes of stress after earthquakes. The elastic dislocation model has been widely applied to interpreting observed shear deformation caused by earthquakes. The application of the same theory to interpreting volumetric strain, however, has met with difficulty, especially in the far field of earthquakes. Predicted vol
Authors
Chi-Yuen Wang, Andrew J. Barbour
Source spectral properties of small-to-moderate earthquakes in southern Kansas
The source spectral properties of injection-induced earthquakes give insight into their nucleation, rupture processes, and influence on ground motion. Here we apply a spectral decomposition approach to analyze P-wave spectra and estimate Brune-type stress drop for more than 2000 ML1.5–5.2 earthquakes occurring in southern Kansas from 2014 to 2016. We find that these earthquakes are characterized b
Authors
Daniel T. Trugman, Sara L. Dougherty, Elizabeth S. Cochran, Peter M. Shearer
Seismic response of soft deposits due to landslide: The Mission Peak, California, landslide
The seismic response of active and intermittently active landslides is an important issue to resolve to determine if such landslides present an elevated hazard in future earthquakes. To study the response of landslide deposits, seismographs were placed on the Mission Peak landslide in the eastern San Francisco Bay region for a period of one year. Numerous local and near‐regional earthquakes were r
Authors
Stephen H. Hartzell, Alena L. Leeds, Randall W. Jibson
Influence of the megathrust earthquake cycle on upper-plate deformation in the Cascadia forearc of Washington State, USA
The influence of subduction zone earthquake cycle processes on permanent forearc deformation is poorly understood. In the Cascadia subduction zone forearc of Washington State, USA, deformed and incised fluvial terraces serve as archives of longer-term (103–104 yr) strain manifest as both fluvial incision and slip on upper-plate faults. We focus on comparing these geomorphic records in the Wynooche
Authors
Jaime E. Delano, Colin B. Amos, John P. Loveless, Tammy M. Rittenour, Brian Sherrod, Lynch M. Emerson
Detection and characterization of pulses in broadband seismometers
Pulsing - caused either by mechanical or electrical glitches, or by microtilt local to a seismometer - can significantly compromise the long‐period noise performance of broadband seismometers. High‐fidelity long‐period recordings are needed for accurate calculation of quantities such as moment tensors, fault‐slip models, and normal‐mode measurements. Such pulses have long been recognized in accele
Authors
David C. Wilson, Adam T. Ringler, Charles R. Hutt
Conversion of wet glass to melt at lower seismogenic zone conditions: Implications for pseudotachylyte creep
Coseismic frictional melting and the production of quenched glass called pseudotachylyte is a recurring process during earthquakes. To investigate how glassy materials affect the postseismic strength and stability of faults, obsidian gouges were sheared under dry and wet conditions from 200°C to 300°C at ~150 MPa effective normal stress. Dry glass exhibited a brittle rheology at all conditions tes
Authors
Brooks P. Proctor, David A. Lockner, Jacob B. Lowenstern, Nicholas M. Beeler
3-D simulations of M9 earthquakes on the Cascadia Megathrust: Key parameters and uncertainty
Geologic and historical records indicate that the Cascadia subduction zone is capable of generating large, megathrust earthquakes up to magnitude 9. The last great Cascadia earthquake occurred in 1700, and thus there is no direct measure on the intensity of ground shaking or specific rupture parameters from seismic recordings. We use 3-D numerical simulations to generate broadband (0-10 Hz) synthe
Authors
Erin Wirth, Arthur Frankel, John Vidale, Nasser A. Marafi, William J. Stephenson
Presentation and analysis of a worldwide database of earthquake-induced landslide inventories
Earthquake-induced landslide (EQIL) inventories are essential tools to extend our knowledge of the relationship between earthquakes and the landslides they can trigger. Regrettably, such inventories are difficult to generate and therefore scarce, and the available ones differ in terms of their quality and level of completeness. Moreover, access to existing EQIL inventories is currently difficult b
Authors
Hakan Tanyas, Cees J. van Westen, Kate E. Allstadt, M. Anna Nowicki Jessee, Tolga Gorum, Randall W. Jibson, Jonathan W. Godt, Hiroshi P. Sato, Robert G. Schmitt, Odin Marc, Niels Hovius
Wastewater disposal and the earthquake sequences during 2016 near Fairview, Pawnee, and Cushing, Oklahoma
Each of the three earthquake sequences in Oklahoma in 2016—Fairview, Pawnee, and Cushing—appears to have been induced by high-volume wastewater disposal within 10 km. The Fairview M5.1 main shock was part of a 2 year sequence of more than 150 events of M3, or greater; the main shock accounted for about half of the total moment. The foreshocks and aftershocks of the M5.8 Pawnee earthquake were too
Authors
Arthur F. McGarr, Andrew J. Barbour
2017 Valparaíso earthquake sequence and the megathrust patchwork of central Chile
In April 2017, a sequence of earthquakes offshore Valparaíso, Chile, raised concerns of a potential megathrust earthquake in the near future. The largest event in the 2017 sequence was a M6.9 on 24 April, seemingly colocated with the last great-sized earthquake in the region—a M8.0 in March 1985. The history of large earthquakes in this region shows significant variation in rupture size and extent
Authors
Jennifer Nealy, Matthew W. Herman, Ginevra Moore, Gavin P. Hayes, Harley M. Benz, Eric A. Bergman, Sergio E Barrientos
Forecasting the (un)productivity of the 2014 M 6.0 South Napa aftershock sequence
The 24 August 2014 Mw 6.0 South Napa mainshock produced fewer aftershocks than expected for a California earthquake of its magnitude. In the first 4.5 days, only 59 M≥1.8 aftershocks occurred, the largest of which was an M 3.9 that happened a little over two days after the mainshock. We investigate the aftershock productivity of the South Napa sequence and compare it with other M≥5.5 California st
Authors
Andrea L. Llenos, Andrew J. Michael
Performance of Irikura recipe rupture model generator in earthquake ground motion simulations with Graves and Pitarka hybrid approach
We analyzed the performance of the Irikura and Miyake (Pure and Applied Geophysics 168(2011):85–104, 2011) (IM2011) asperity-based kinematic rupture model generator, as implemented in the hybrid broadband ground motion simulation methodology of Graves and Pitarka (Bulletin of the Seismological Society of America 100(5A):2095–2123, 2010), for simulating ground motion from crustal earthquakes of int
Authors
Arben Pitarka, Robert Graves, Kojiro Irikura, Hiroe Miyake, Arthur Rodgers